M5lp 1211 07 2013 Gt500 Bolt Ons Let It Eat

To ramp up boost and retain proper belt wrap, Lethal chose to install a 15-percent overdriven damper from Innovators West (PN IW-828; $649). This SFI-approved harmonic balancer obviously spins the supercharger 15 percent faster, which results in a couple extra pounds of boost. You do have to trim down the crank trigger mounting boss to gain the necessary clearance, but the 38.24 hp and 54.53 lb-ft of torque peak gains make that effort worthwhile.